Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective mathematics, physics Of a four-vector in representing a point in spacetime, having a positive four-vector norm.
  • adjective physics (of the interval between two events in spacetime) Having overlapping light cones, so that information can pass from one to the other, and one can be envisaged as a cause of the other.

Etymologies

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Examples

  • Now, in an open or flat Friedmann-Robertson-Walker cosmological model with no cosmological constant, whilst the past 'Big-Bang' singularity corresponds to a spacelike hypersurface in the boundary of the conformal compactification, the future timelike infinity corresponds to a single point.

    Archive 2009-05-01

  • The far future of our universe is therefore representable by de Sitter space-time, and in this type of space-time the future timelike boundary is a spacelike hypersurface.

    Archive 2009-05-01

  • The boundary of the conformal compactification contains components which correspond to singularities, and components which correspond to spacelike infinity, timelike infinity, (and null infinity).

    Archive 2009-05-01

  • And Frank Tipler, in his youth, did some pioneering research on closed timelike curves in general relativity, so he has credentials as an honest physicist.

    Accusations and Assumptions: Another Mythicist-Creationist Parallel

  • The result is a nonzero interval, spacelike for two photons emitted simultaneously from a source and timelike between different points on the worldline of a photon bouncing between mirrors.

    Are Changes Brewing and How Does the Mind Fit In?

  • The math is almost identical to my example, except that you get a timelike interval instead of a spacelike one.

    Are Changes Brewing and How Does the Mind Fit In?

  • The interval is zero between two points within a single lap, but it is nonzero (and timelike) when you take points on two different laps.

    Are Changes Brewing and How Does the Mind Fit In?

  • But there are soulutions that allow 'closed timelike curves' - travel backwards in time, at least back to a defined origin.

    Is Time Travel Inevitable?

  • The math is almost identical to my example, except that you get a timelike interval instead of a spacelike one.

    Are Changes Brewing and How Does the Mind Fit In?

  • The interval is zero between two points within a single lap, but it is nonzero (and timelike) when you take points on two different laps.

    Are Changes Brewing and How Does the Mind Fit In?

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